len() is broken in some circumstances with 2.15

[xevdev]

Len() doesn't recognize an array I just used. I use len() quite a lot and it usually works fine.
This programme had no issues in 2.14.
Neither did my last wormhole update before the 2.15 release but it broke from this issue. My work around was to dump the ( apparently non existant ) array into a temporary local array then place it back at the end.

[pianofire]

Thanks for reporting. We will look into it